.form-wrap {
    margin: 0 auto;
    overflow: hidden;
    width: 530px;
    height: 447px;
    position: relative;
    top: 0;
    transition: all 1s ease-in-out 0.3s;
    z-index: 0;
    cursor: pointer;
    &.is-show {
      height: 1150px;
      top: -200px;
    }
  }
  
  .before-img {
    position: absolute;
    bottom: 126px;
    left: 0;
    background-repeat: no-repeat;
    width: 530px;
    height: 317px;
    z-index: -100;
  }
  
  .after-img {
    position: absolute;
    bottom: -2px;
    left: 0;
    background-repeat: no-repeat;
    width: 530px;
    height: 259px;
    z-index: 100;
  }
  
  .envelope {
    position: relative;
    margin: 0 auto;
    transition: all 1s ease-in-out 0.3s;
    padding: 200px 20px 20px;
  }
  
  .form-main {
    background: #fff;
    margin: 0 auto;
    border-radius: 10px;
    overflow: hidden;
    .welcome-tip {
      text-align: center;
    }
  }
  
  .form-friend {
    margin-top: 12px;
    background-color: #eee;
    border: #ddd 1px solid;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    .form-item {
      height: 55px;
      line-height: 55px;
      text-align: center;
      .form-input {
        border: none;
        height: 35px;
        padding: 0 15px;
        color: #606266;
        border-radius: 4px;
        &:focus-visible {
          outline: none;
        }
      }
    }
  }
  .submit-btn {
    border: none;
    background: rgb(131, 123, 199);
    height: 32px;
    line-height: 32px;
    width: 66px;
    text-align: center;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
  }